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Five Arab states have joined the U.S. in the operation against ISIS in Syria. Elise Labott explains the coalition.
U.S. Secy. of Homeland Security Jeh Johnson talks to Wolf Blitzer about whether Americans are fighting in Syria.
CNN's Barbara Starr reports that ISIS forces have taken over 60 villages in northern Syria.
An al Qaeda cell operating in Syria is posing a new threat to the U.S. CNN's Pamela Brown has the details.
President Obama visited the U.S. Central Command, which is planning the current airstrike campaign in Iraq.
The CIA now says there are between 20,000 to 31,500 ISIS fighters operating in Iraq and Syria. CNN's Jim Sciutto reports.
Sen. Saxby Chambliss says the brutal terror group poses a direct threat to America.
ISIS militants might be among the best equipped jihadist groups in the world. CNN's Pamela Brown reports.
After growing fears that Westerners inside Syria were training with al Qaeda's affiliates, Islamic militants now claim an American carried out a suicide attack against a regime military checkpoint. CNN's Mohammed Jamjoom reports.